Slides over pipe for pitch up to 45 degrees. Non-fading, non-cracking, and non-rusting bases and sealing collars. Rated 180 degrees Fahrenheit continuous heat. Approved for Type B installations. Ring on collar tears off, allowing flashings to seal different pipe diameters. Base made of rigid thermoplastic. Not for hot-mopped or built-up roofs. Do not use petroleum based products on plastic bases or rubber collars.